How to use Forward method of gvisor Package

Best Syzkaller code snippet using gvisor.Forward

stack.go

Source:stack.go

...46	if t.IsTCP() {47		t.GetTCP().Request.Complete(reset)48	}49}50// TCPConn represents a TCP Forwarder connection51type TCPConn struct {52	EndpointID stack.TransportEndpointID53	Request    *tcp.ForwarderRequest54}55// UDPConn represents a UDP Forwarder connection56type UDPConn struct {57	EndpointID stack.TransportEndpointID58	Request    *udp.ForwarderRequest59}60// ICMPConn represents a ICMP Packet Buffer61type ICMPConn struct {62	Request *stack.PacketBuffer63}64// NetStack is the structure used to store the connection pool and the gvisor network stack65type NetStack struct {66	pool  *ConnPool67	stack *stack.Stack68	sync.Mutex69}70type StackSettings struct {71	TunName     string72	MaxInflight int73}74// NewStack registers a new GVisor Network Stack75func NewStack(settings StackSettings, connPool *ConnPool) *NetStack {76	ns := NetStack{pool: connPool}77	ns.new(settings)78	return &ns79}80// GetStack returns the current Gvisor stack.Stack object81func (s *NetStack) GetStack() *stack.Stack {82	return s.stack83}84// SetConnPool is used to change the current connPool. It must be used after switching Ligolo agents85func (s *NetStack) SetConnPool(connPool *ConnPool) {86	s.Lock()87	s.pool = connPool88	s.Unlock()89}90// New creates a new userland network stack (using Gvisor) that listen on a tun interface.91func (s *NetStack) new(stackSettings StackSettings) *stack.Stack {92	// Create a new gvisor userland network stack.93	ns := stack.New(stack.Options{94		NetworkProtocols: []stack.NetworkProtocolFactory{95			ipv4.NewProtocol,96			ipv6.NewProtocol,97		},98		TransportProtocols: []stack.TransportProtocolFactory{99			tcp.NewProtocol,100			udp.NewProtocol,101			icmp.NewProtocol4,102			icmp.NewProtocol6,103		},104		HandleLocal: false,105	})106	s.stack = ns107	// Gvisor Hack: Disable ICMP handling.108	ns.SetICMPLimit(0)109	ns.SetICMPBurst(0)110	// Forward TCP connections111	tcpHandler := tcp.NewForwarder(ns, 0, stackSettings.MaxInflight, func(request *tcp.ForwarderRequest) {112		tcpConn := TCPConn{113			EndpointID: request.ID(),114			Request:    request,115		}116		s.Lock()117		defer s.Unlock()118		if s.pool == nil || s.pool.Closed() {119			return // If connPool is closed, ignore packet.120		}121		if err := s.pool.Add(TunConn{122			tcp.ProtocolNumber,123			tcpConn,124		}); err != nil {125			logrus.Error(err)126		}127	})128	// Forward UDP connections129	udpHandler := udp.NewForwarder(ns, func(request *udp.ForwarderRequest) {130		udpConn := UDPConn{131			EndpointID: request.ID(),132			Request:    request,133		}134		s.Lock()135		defer s.Unlock()136		if s.pool == nil || s.pool.Closed() {137			return // If connPool is closed, ignore packet.138		}139		if err := s.pool.Add(TunConn{140			udp.ProtocolNumber,141			udpConn,142		}); err != nil {143			logrus.Error(err)144		}145	})146	// Register forwarders147	ns.SetTransportProtocolHandler(tcp.ProtocolNumber, tcpHandler.HandlePacket)148	ns.SetTransportProtocolHandler(udp.ProtocolNumber, udpHandler.HandlePacket)149	linkEP, err := tun.Open(stackSettings.TunName)150	if err != nil {151		logrus.Fatalf("unable to create tun interface: (tun.Open %v), make sure you created the tun interface", err)152	}153	// Create a new NIC154	if err := ns.CreateNIC(1, linkEP); err != nil {155		panic(fmt.Errorf("CreateNIC: %v", err))156	}157	// Start a endpoint that will reply to ICMP echo queries158	if err := icmpResponder(s); err != nil {159		logrus.Fatal(err)160	}161	// Allow all routes by default162	ns.SetRouteTable([]tcpip.Route{163		{164			Destination: header.IPv4EmptySubnet,165			NIC:         1,166		},167		{168			Destination: header.IPv6EmptySubnet,169			NIC:         1,170		},171	})172	// Enable forwarding173	ns.SetForwardingDefaultAndAllNICs(ipv4.ProtocolNumber, false)174	ns.SetForwardingDefaultAndAllNICs(ipv6.ProtocolNumber, false)175	// Enable TCP SACK176	nsacks := tcpip.TCPSACKEnabled(false)177	ns.SetTransportProtocolOption(tcp.ProtocolNumber, &nsacks)178	// Disable SYN-Cookies, as this can mess with nmap scans179	synCookies := tcpip.TCPAlwaysUseSynCookies(false)180	ns.SetTransportProtocolOption(tcp.ProtocolNumber, &synCookies)181	// Allow packets from all sources/destinations182	ns.SetPromiscuousMode(1, true)183	ns.SetSpoofing(1, true)184	return ns185}...

tun2socks.go

Source:tun2socks.go

...26		return27	}28	sock5Addr = _sock5Addr29	tunDNS = _tunDNS30	ForwardTransportFromIo(dev, mtu, rawTcpForwarder, rawUdpForwarder)31}32func rawTcpForwarder(conn core.CommTCPConn) error {33	defer conn.Close()34	socksConn, err1 := net.Dial("tcp", sock5Addr)35	if err1 != nil {36		log.Println(err1)37		return nil38	}39	defer socksConn.Close()40	if socks.SocksCmd(socksConn, 1, conn.LocalAddr().String()) == nil {41		go io.Copy(conn, socksConn)42		io.Copy(socksConn, conn)43	}44	return nil45}46func rawUdpForwarder(conn core.CommUDPConn, ep core.CommEndpoint) error {47	defer conn.Close()48	//dns port49	if strings.HasSuffix(conn.LocalAddr().String(), ":53") {50		dnsReq(conn, "udp", tunDNS)51	}52	return nil53}54func ForwardTransportFromIo(dev io.ReadWriteCloser, mtu int, tcpCallback core.ForwarderCall, udpCallback core.UdpForwarderCall) error {55	_, channelLinkID, err := core.NewDefaultStack(mtu, tcpCallback, udpCallback)56	if err != nil {57		log.Printf("err:%v", err)58		return err59	}60	ctx, cancel := context.WithCancel(context.Background())61	defer cancel()62	// write tun63	go func(_ctx context.Context) {64		for {65			info := channelLinkID.ReadContext(_ctx)66			if info == nil {67				log.Printf("channelLinkID exit \r\n")68				break...

Forward

Using AI Code Generation

1import (2func main() {3    s := stack.New([]string{ipv4.ProtocolName, ipv6.ProtocolName}, []string{tcp.ProtocolName, udp.ProtocolName, icmp.ProtocolName4, icmp.ProtocolName6, raw.ProtocolName4, raw.ProtocolName6}, stack.Options{})4    nicID := s.CreateNIC(1, loopback.New())5    s.AddAddress(nicID, ipv4.ProtocolNumber, "\x0a\x00\x00\x01")6    s.AddAddress(nicID, ipv6.ProtocolNumber, "\xfe\x80\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x01")7    r, err := s.FindRoute(nicID, "", "\x0a\x00\x00\x02", ipv4.ProtocolNumber, false)8    if err != nil {9        panic(err)10    }11    pkt := stack.NewPacketBuffer(stack.PacketBufferOptions{12        Data: buffer.View([]byte("Hello World")).ToVectorisedView(),13    })14    hdr := buffer.NewPrependableFromView(buffer.View(icmpEchoRequest(header.ICMPv4MinimumSize)))15    err = r.Forward(pkt, hdr, header.ICMP

Forward

Using AI Code Generation

1func main() {2    gvisor := gvisor.NewGVisor()3    gvisor.Forward()4}5func main() {6    gvisor := gvisor.NewGVisor()7    gvisor.Forward()8}9func main() {10    gvisor := gvisor.NewGVisor()11    gvisor.Forward()12}13func main() {14    gvisor := gvisor.NewGVisor()15    gvisor.Forward()16}17func main() {18    gvisor := gvisor.NewGVisor()19    gvisor.Forward()20}21func main() {22    gvisor := gvisor.NewGVisor()23    gvisor.Forward()24}25func main() {26    gvisor := gvisor.NewGVisor()27    gvisor.Forward()28}29func main() {30    gvisor := gvisor.NewGVisor()31    gvisor.Forward()32}33func main() {34    gvisor := gvisor.NewGVisor()35    gvisor.Forward()36}37func main() {38    gvisor := gvisor.NewGVisor()39    gvisor.Forward()40}41func main() {42    gvisor := gvisor.NewGVisor()43    gvisor.Forward()44}45func main() {46    gvisor := gvisor.NewGVisor()47    gvisor.Forward()48}49func main() {50    gvisor := gvisor.NewGVisor()

Forward

Using AI Code Generation

1import (2func main() {3    g, err := gvisor.New()4    if err != nil {5        fmt.Println("Error in creating gvisor object")6    }7    l, err := net.Listen("tcp", "localhost:10000")8    if err != nil {9        fmt.Println("Error in creating TCP listener")10    }11    err = g.Forward(l)12    if err != nil {13        fmt.Println("Error in forwarding the TCP listener")14    }15    for {16        c, err := l.Accept()17        if err != nil {18            fmt.Println("Error in accepting a connection")19        }20        go handleConnection(c)21    }22}23func handleConnection(c net.Conn) {24    for {25        buf := make([]byte, 1024)26        n, err := c.Read(buf)27        if err != nil {28            fmt.Println("Error in reading data from TCP connection")29        }30        _, err = c.Write(buf[:n])31        if err != nil {32            fmt.Println("Error in writing data to TCP connection")33        }34    }35}36import (37func main() {38    g, err := gvisor.New()39    if err != nil {40        fmt.Println("Error in creating gvisor object")41    }42    l, err := g.Listen("tcp", "localhost:10000")43    if err != nil {44        fmt.Println("Error in listening on a TCP port")45    }46    for {47        c, err := l.Accept()48        if err != nil {49            fmt.Println("Error in accepting a connection")50        }

Forward

Using AI Code Generation

1import (2func main() {3	g.Forward()4	fmt.Printf("Main method")5}6import (7func main() {8	g.Forward()9	fmt.Printf("Main method")10}11import (12func main() {13	g.Forward()14	fmt.Printf("Main method")15}16import (17func main() {18	g.Forward()19	fmt.Printf("Main method")20}21import (22func main() {23	g.Forward()24	fmt.Printf("Main method")25}26import (27func main() {28	g.Forward()29	fmt.Printf("Main method")30}31import (32func main() {33	g.Forward()34	fmt.Printf("Main method")35}36import (37func main() {38	g.Forward()39	fmt.Printf("Main method")40}41import (42func main() {43	g.Forward()44	fmt.Printf("Main method")45}46import (47func main() {

Forward

Using AI Code Generation

1import (2func main() {3	gvisor := mygvisor.NewGvisor()4	gvisor.Forward()5	fmt.Println("Hello World")6}7import (8func main() {9	gvisor := mygvisor.NewGvisor()10	gvisor.Forward()11	fmt.Println("Hello World")12}13import (14func main() {15	gvisor := mygvisor.NewGvisor()16	gvisor.Forward()17	fmt.Println("Hello World")18}19import (20func main() {21	gvisor := mygvisor.NewGvisor()22	gvisor.Forward()23	fmt.Println("Hello World")24}25import (26func main() {27	gvisor := mygvisor.NewGvisor()28	gvisor.Forward()29	fmt.Println("Hello World")30}31import (32func main() {33	gvisor := mygvisor.NewGvisor()34	gvisor.Forward()35	fmt.Println("Hello World")36}37import (38func main() {39	gvisor := mygvisor.NewGvisor()40	gvisor.Forward()41	fmt.Println("Hello World")42}

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